Filed under: Featured Videos , News , UFC , Videos LAS VEGAS – As a former Invicta FC strawweight champion,  Carla Esparza is no stranger to big fights and tough challengers. But as she stands just one win away from UFC gold, Esparza believes  Rosa Namajunas may just be the best fighter she’s ever faced. “Rose, I would say, probably has some of the best submissions in the division, and her striking is very good, as well,” Esparza said. “She is a very well-rounded fighter, maybe my toughest opponent to date. “I think it will be a war.